Essential University Physics: Volume 1 (3rd Edition)

by
Wolfson, Richard

Published by
Pearson

ISBN 10:
0321993721

ISBN 13:
978-0-32199-372-4

Chapter 7 - Exercises and Problems: 12

Answer

Please see the work below.

Work Step by Step

We know that
(a) $U_{33}=mg\Delta y$
We plug in the known values to obtain:
$U_{33}=62KJ$
(b) $U_{59}=mg\Delta y$
We plug in the known values to obtain:
$U_{59}=(55)(9.8)(3.5)=111KJ$
(c) $U_{street}=mg\Delta y$
We plug in the known values to obtain:
$U_{street}=(55)(9.8)(0.0)=0.0KJ$